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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74d9fa0a8fb0842f417140e67c5781a1da20b628c3102d17a09b4923114d76d0' 
  AND token = 'KdfwPj0Krp+OulYIoyFN4Cmbcu9gJg+oPrRmLOA3wE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}